Hi All
I have a problem whilst implementing a custom URLProtocol for use with
av_open_input_file(...). I am trying to use the protocol so that a
custom url_read method will receive data from a callback which the user
can supply from the calling application. To illustrate, I have the
following methods for the url_open and url_read (which are both static
member functions of an unmanaged C++ class)
int BufferProtocol::BufferOpen(URLContext *h, const char
*pseudofilename, int flags)
{
//setup the buffer
BUFFER *buffer = new BUFFER();
buffer->buflen = BUFFERLENGTH;
buffer->offset = 0;
buffer->buf = new unsigned char[BUFFERLENGTH];
memset(buffer->buf, 0, BUFFERLENGTH);
//assign the URLContext's private data to be the buffer
h->priv_data = buffer;
return 1;
}
int BufferProtocol::BufferRead(URLContext *h, unsigned char *buf, int size)
{
BUFFER *buffer = (BUFFER*)h->priv_data;
int amountRead = 1024;
unsigned char* data = HELP_HERE_PLEASE
...
...
}
So in the above Read method I want to invoke a callback which will
prompt for a certain number of bytes and return the received data (which
can be put into *buf). I understand how this would work with a typical
callback but I have one more problem - because I am using Class members
for the URLProtocol they have to be static, also the application that is
going to use this will probably call av_open_input_file(...) more than
once (for multiple input buffer sources) and because the methods are all
static I will not be able to tell which buffer the callback refers to.
This is kind of confusing to describe and I hope that my point is clear
enough to understand.
Thanks,
Mark.
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